refactor: unify timezone parameter naming across Python and JS wrappers

- Rename timezone_id → timezone in launch_context(), launch_persistent_context(),
  and launch_persistent_context_async() (Python)
- Extract _migrate_timezone_id() helper for deprecation compat (DRY)
- Always pop timezone_id from kwargs to prevent override via context_kwargs.update()
- Use FutureWarning (visible by default) instead of DeprecationWarning
- JS: deprecate timezoneId on LaunchContextOptions with runtime shim
- Extract migrateTimezoneId<T>() shared helper in playwright.ts (DRY)
- Bump version to 0.3.7 in _version.py and package.json
- Add 4 Python + 4 JS unit tests for deprecation compat behavior

CHANGELOG.md

@@ -6,6 +6,10 @@ Changes are tagged: **[wrapper]** for Python/JS wrapper, **[binary]** for Chromi
 
 ---
 
+## [0.3.7] — 2026-03-05
+
+- **[wrapper]** Unify timezone parameter: rename `timezone_id` to `timezone` in `launch_context()`, `launch_persistent_context()`, and `launch_persistent_context_async()` (Python). Old `timezone_id` still works with a deprecation warning. JS: deprecate `timezoneId` on `LaunchContextOptions` — use `timezone` (inherited from `LaunchOptions`)
+
 ## [0.3.6] — 2026-03-04
 
 - **[wrapper]** `proxy` parameter now accepts a Playwright proxy dict (`{server, bypass, username, password}`) in addition to URL strings — enables bypass lists and separate auth fields (PR #24). **TS note:** type changed from `string` to `string | object` — code that assumed `proxy` is always a string may need a `typeof` narrowing check

README.md

@@ -251,7 +251,7 @@ context = launch_context(
     user_agent="Custom UA",
     viewport={"width": 1920, "height": 1080},
     locale="en-US",
-    timezone_id="America/New_York",
+    timezone="America/New_York",
 )
 page = context.new_page()
 page.goto("https://protected-site.com")
@@ -281,7 +281,7 @@ ctx.close()  # profile saved
 ctx = launch_persistent_context("./my-profile", headless=False)
 ```
 
-Supports all the same options as `launch_context()`: `proxy`, `user_agent`, `viewport`, `locale`, `timezone_id`, `color_scheme`, `geoip`.
+Supports all the same options as `launch_context()`: `proxy`, `user_agent`, `viewport`, `locale`, `timezone`, `color_scheme`, `geoip`.
 
 Async version: `launch_persistent_context_async()`.
 
@@ -327,7 +327,7 @@ const context = await launchContext({
   userAgent: 'Custom UA',
   viewport: { width: 1920, height: 1080 },
   locale: 'en-US',
-  timezoneId: 'America/New_York',
+  timezone: 'America/New_York',
 });
 const page = await context.newPage();
 

cloakbrowser/_version.py

@@ -1 +1 @@
-__version__ = "0.3.6"
+__version__ = "0.3.7"

cloakbrowser/browser.py

@@ -16,6 +16,7 @@ from __future__ import annotations
 
 import logging
 import os
+import warnings
 from typing import Any, Literal, TypedDict
 from urllib.parse import unquote, urlparse, urlunparse
 
@@ -25,6 +26,17 @@ from .download import ensure_binary
 logger = logging.getLogger("cloakbrowser")
 
 
+def _migrate_timezone_id(timezone: str | None, kwargs: dict[str, Any]) -> str | None:
+    """Pop deprecated timezone_id from kwargs, warn, return resolved timezone."""
+    if "timezone_id" in kwargs:
+        warnings.warn("timezone_id is deprecated, use timezone instead", FutureWarning, stacklevel=3)
+        if timezone is None:
+            timezone = kwargs.pop("timezone_id")
+        else:
+            kwargs.pop("timezone_id")
+    return timezone
+
+
 class _ProxySettingsRequired(TypedDict):
     server: str
 
@@ -184,7 +196,7 @@ def launch_persistent_context(
     user_agent: str | None = None,
     viewport: dict | None = None,
     locale: str | None = None,
-    timezone_id: str | None = None,
+    timezone: str | None = None,
     color_scheme: Literal["light", "dark", "no-preference"] | None = None,
     geoip: bool = False,
     **kwargs: Any,
@@ -206,7 +218,7 @@ def launch_persistent_context(
         user_agent: Custom user agent string.
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
         locale: Browser locale, e.g. "en-US".
-        timezone_id: Timezone, e.g. "America/New_York".
+        timezone: IANA timezone (e.g. 'America/New_York').
         color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
             Default: None (uses Chromium default, which is 'light').
         geoip: Auto-detect timezone/locale from proxy IP (default False).
@@ -226,9 +238,11 @@ def launch_persistent_context(
     """
     from patchright.sync_api import sync_playwright
 
+    timezone = _migrate_timezone_id(timezone, kwargs)
+
     binary_path = ensure_binary()
-    timezone_id, locale = _maybe_resolve_geoip(geoip, proxy, timezone_id, locale)
+    timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
-    chrome_args = _build_args(stealth_args, args, timezone=timezone_id, locale=locale)
+    chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
 
     logger.debug(
         "Launching persistent stealth Chromium (headless=%s, user_data_dir=%s)",
@@ -242,8 +256,8 @@ def launch_persistent_context(
     context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
     if locale:
         context_kwargs["locale"] = locale
-    if timezone_id:
+    if timezone:
-        context_kwargs["timezone_id"] = timezone_id
+        context_kwargs["timezone_id"] = timezone
     if color_scheme:
         context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)
@@ -280,7 +294,7 @@ async def launch_persistent_context_async(
     user_agent: str | None = None,
     viewport: dict | None = None,
     locale: str | None = None,
-    timezone_id: str | None = None,
+    timezone: str | None = None,
     color_scheme: Literal["light", "dark", "no-preference"] | None = None,
     geoip: bool = False,
     **kwargs: Any,
@@ -301,7 +315,7 @@ async def launch_persistent_context_async(
         user_agent: Custom user agent string.
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
         locale: Browser locale, e.g. "en-US".
-        timezone_id: Timezone, e.g. "America/New_York".
+        timezone: IANA timezone (e.g. 'America/New_York').
         color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
         geoip: Auto-detect timezone/locale from proxy IP (default False).
         **kwargs: Passed directly to playwright.chromium.launch_persistent_context().
@@ -324,9 +338,11 @@ async def launch_persistent_context_async(
     """
     from patchright.async_api import async_playwright
 
+    timezone = _migrate_timezone_id(timezone, kwargs)
+
     binary_path = ensure_binary()
-    timezone_id, locale = _maybe_resolve_geoip(geoip, proxy, timezone_id, locale)
+    timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
-    chrome_args = _build_args(stealth_args, args, timezone=timezone_id, locale=locale)
+    chrome_args = _build_args(stealth_args, args, timezone=timezone, locale=locale)
 
     logger.debug(
         "Launching persistent stealth Chromium async (headless=%s, user_data_dir=%s)",
@@ -340,8 +356,8 @@ async def launch_persistent_context_async(
     context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
     if locale:
         context_kwargs["locale"] = locale
-    if timezone_id:
+    if timezone:
-        context_kwargs["timezone_id"] = timezone_id
+        context_kwargs["timezone_id"] = timezone
     if color_scheme:
         context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)
@@ -377,7 +393,7 @@ def launch_context(
     user_agent: str | None = None,
     viewport: dict | None = None,
     locale: str | None = None,
-    timezone_id: str | None = None,
+    timezone: str | None = None,
     color_scheme: Literal["light", "dark", "no-preference"] | None = None,
     geoip: bool = False,
     **kwargs: Any,
@@ -395,7 +411,7 @@ def launch_context(
         user_agent: Custom user agent string.
         viewport: Viewport size dict, e.g. {"width": 1920, "height": 1080}.
         locale: Browser locale, e.g. "en-US".
-        timezone_id: Timezone, e.g. "America/New_York".
+        timezone: IANA timezone (e.g. 'America/New_York').
         color_scheme: Color scheme preference — 'light', 'dark', or 'no-preference'.
             Default: None (uses Chromium default, which is 'light').
             Note: 'no-preference' doesn't work in Patchright (falls back to 'light').
@@ -405,9 +421,11 @@ def launch_context(
     Returns:
         Playwright BrowserContext object.
     """
+    timezone = _migrate_timezone_id(timezone, kwargs)
+
     # Resolve geoip BEFORE launch() to avoid double-resolution and ensure
     # resolved values flow to both binary flags AND context params
-    timezone_id, locale = _maybe_resolve_geoip(geoip, proxy, timezone_id, locale)
+    timezone, locale = _maybe_resolve_geoip(geoip, proxy, timezone, locale)
     # Skip --fingerprint-timezone binary flag: it only applies to the default
     # context and interferes with Playwright's timezone_id on new contexts.
     # Timezone is set via browser.new_context(timezone_id=...) below instead.
@@ -420,8 +438,8 @@ def launch_context(
     context_kwargs["viewport"] = viewport or DEFAULT_VIEWPORT
     if locale:
         context_kwargs["locale"] = locale
-    if timezone_id:
+    if timezone:
-        context_kwargs["timezone_id"] = timezone_id
+        context_kwargs["timezone_id"] = timezone
     if color_scheme:
         context_kwargs["color_scheme"] = color_scheme
     context_kwargs.update(kwargs)

js/README.md

@@ -97,7 +97,7 @@ const context = await launchContext({
   userAgent: 'Custom UA',
   viewport: { width: 1920, height: 1080 },
   locale: 'en-US',
-  timezoneId: 'America/New_York',
+  timezone: 'America/New_York',
 });
 
 // Persistent profile — stay logged in, bypass incognito detection, load extensions

js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "cloakbrowser",
-  "version": "0.3.6",
+  "version": "0.3.7",
   "description": "Stealth Chromium that passes every bot detection test. Drop-in Playwright/Puppeteer replacement with source-level fingerprint patches.",
   "type": "module",
   "main": "dist/index.js",

js/src/playwright.ts

@@ -9,6 +9,17 @@ import { DEFAULT_VIEWPORT, getDefaultStealthArgs } from "./config.js";
 import { ensureBinary } from "./download.js";
 import { parseProxyUrl } from "./proxy.js";
 
+/** @internal Migrate deprecated timezoneId → timezone, warn once. Exported for testing. */
+export function migrateTimezoneId<T extends { timezone?: string; timezoneId?: string }>(options: T): T {
+  if (options.timezoneId != null) {
+    console.warn("[cloakbrowser] timezoneId is deprecated, use timezone instead");
+    const merged = { ...options, timezone: options.timezone ?? options.timezoneId };
+    delete (merged as any).timezoneId;
+    return merged;
+  }
+  return options;
+}
+
 /**
  * Launch stealth Chromium browser via Playwright.
  *
@@ -62,6 +73,7 @@ export async function launch(options: LaunchOptions = {}): Promise<Browser> {
 export async function launchContext(
   options: LaunchContextOptions = {}
 ): Promise<BrowserContext> {
+  options = migrateTimezoneId(options);
   // Resolve geoip BEFORE launch() to avoid double-resolution
   const resolved = await maybeResolveGeoip(options);
   // Skip --fingerprint-timezone binary flag: it only applies to the default
@@ -117,6 +129,7 @@ export async function launchContext(
 export async function launchPersistentContext(
   options: LaunchPersistentContextOptions
 ): Promise<BrowserContext> {
+  options = migrateTimezoneId(options);
   const { chromium } = await import("playwright-core");
 
   const binaryPath = process.env.CLOAKBROWSER_BINARY_PATH || (await ensureBinary());

js/src/types.ts

@@ -33,7 +33,7 @@ export interface LaunchContextOptions extends LaunchOptions {
   viewport?: { width: number; height: number };
   /** Browser locale, e.g. "en-US". */
   locale?: string;
-  /** Timezone, e.g. "America/New_York". */
+  /** @deprecated Use `timezone` (inherited from LaunchOptions) instead. */
   timezoneId?: string;
   /** Color scheme preference — 'light', 'dark', or 'no-preference'. */
   colorScheme?: "light" | "dark" | "no-preference";

js/tests/config.test.ts

@@ -7,7 +7,7 @@ import {
   getBinaryDir,
   getDownloadUrl,
 } from "../src/config.js";
-import { _buildArgsForTest } from "../src/playwright.js";
+import { _buildArgsForTest, migrateTimezoneId } from "../src/playwright.js";
 
 describe("config", () => {
   it("CHROMIUM_VERSION matches expected format", () => {
@@ -98,3 +98,30 @@ describe("buildArgs timezone/locale", () => {
     expect(args.some(a => a.startsWith("--lang="))).toBe(false);
   });
 });
+
+describe("migrateTimezoneId deprecation", () => {
+  it("migrates timezoneId to timezone", () => {
+    const result = migrateTimezoneId({ timezoneId: "Europe/Paris" });
+    expect(result.timezone).toBe("Europe/Paris");
+    expect(result).not.toHaveProperty("timezoneId");
+  });
+
+  it("preserves explicit timezone over timezoneId", () => {
+    const result = migrateTimezoneId({ timezone: "UTC", timezoneId: "Europe/Paris" });
+    expect(result.timezone).toBe("UTC");
+    expect(result).not.toHaveProperty("timezoneId");
+  });
+
+  it("returns options unchanged when no timezoneId", () => {
+    const opts = { timezone: "UTC" };
+    const result = migrateTimezoneId(opts);
+    expect(result).toBe(opts); // same reference, no copy
+    expect(result.timezone).toBe("UTC");
+  });
+
+  it("returns options unchanged when neither is set", () => {
+    const opts = {};
+    const result = migrateTimezoneId(opts);
+    expect(result).toBe(opts);
+  });
+});

tests/test_build_args.py

@@ -1,6 +1,8 @@
-"""Unit tests for _build_args timezone/locale injection."""
+"""Unit tests for _build_args timezone/locale injection and deprecation compat."""
 
-from cloakbrowser.browser import _build_args
+import warnings
+
+from cloakbrowser.browser import _build_args, _migrate_timezone_id
 
 
 def test_timezone_injected():
@@ -44,3 +46,49 @@ def test_extra_args_preserved():
     assert "--disable-gpu" in args
     assert "--fingerprint-timezone=Asia/Tokyo" in args
     assert "--lang=ja-JP" in args
+
+
+# --- _migrate_timezone_id deprecation compat ---
+
+
+def test_migrate_old_param_only():
+    """timezone_id in kwargs should be promoted to timezone."""
+    kwargs = {"timezone_id": "Europe/Paris"}
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        result = _migrate_timezone_id(None, kwargs)
+    assert result == "Europe/Paris"
+    assert "timezone_id" not in kwargs
+    assert len(w) == 1 and issubclass(w[0].category, FutureWarning)
+
+
+def test_migrate_new_param_wins():
+    """Explicit timezone takes precedence; timezone_id is still popped."""
+    kwargs = {"timezone_id": "Europe/Paris"}
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        result = _migrate_timezone_id("UTC", kwargs)
+    assert result == "UTC"
+    assert "timezone_id" not in kwargs
+    assert len(w) == 1
+
+
+def test_migrate_no_old_param():
+    """No warning when timezone_id is absent."""
+    kwargs = {"other": "value"}
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        result = _migrate_timezone_id("UTC", kwargs)
+    assert result == "UTC"
+    assert "other" in kwargs
+    assert len(w) == 0
+
+
+def test_migrate_both_none():
+    """Neither param set — returns None, no warning."""
+    kwargs = {}
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter("always")
+        result = _migrate_timezone_id(None, kwargs)
+    assert result is None
+    assert len(w) == 0